TW479022B - Drive circuit of ink-jet head with temperature detection function - Google Patents

Abstract

A kind of drive circuit of ink-jet head with temperature detection function is disclosed in the present invention, in which a temperature detector and a heater are installed at the jet hole for heating ink to make it spurt from the jet hole and for detecting the ink temperature. The drive circuit of ink-jet head with temperature detection function includes a temperature detection module and a heating module. The temperature detection module is composed of a temperature detector and a temperature detection gate, in which the temperature detector is installed at the position of jet hole and can generate a temperature detection signal corresponding to the temperature of jet hole. The selection signal is fed to the temperature detection gate in order to obtain the temperature detection signal. The heating module is composed of heater and enabling temperature gate. Heater is installed at the position of jet hole. After the selection signal and enabling temperature signal are fed to the heating module, printing work can be conducted.

Description

479022 V. Description of the invention (B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs [Field of invention] The present invention is related to-a type of heating and temperature preparation device: = :: 下 '所 _ 子 Related modern products, such as computers, computers, computers, and office machines, have a long standing standard in terms of function or appearance. Take printers as an example. Years of hard work printing = already = long needle type, black self-laser has progressed to color inkjet and color laser can be thousands of miles away. At present, the average home user, due to the lack of opportunities to print a large number of documents, When purchasing a printer, in order to balance the two phases of the print quality, the color inkjet printer is still selected as T. If the budget is sufficient, an additional black self-lemming material printer is added as a document list. For printing. The current printer market can be expected. According to the report, the competition is very fierce. Major manufacturers have racked their brains to research and develop better and more cost-effective models to attract consumers and increase the market. Occupancy rate, so how to make the product's To improve, it is the common effort of all R & D personnel. At present, most inkjet printers on the market use bubble or piezoelectric inkjet heads to spread the ink onto the paper to complete the printing work. For the bubble type As for the inkjet head, its main components include a heater, ink, and nozzles. The function of the heater is to heat the ink to generate bubbles, and gradually expand the bubbles to push the ink, and the squeezed ink is discharged through the nozzles. When it prints, it will form ink dots. When printing, you only need to control the ink density and thread size. The paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 male # ^ A7. V. B7) Warm function 1 Mozuo drive circuit, the Intellectual Property Bureau of the Ministry of Economic Affairs, the employee consumer cooperatives can print dots to combine many dots into the required text or graphics. The print quality of the printer is very direct with its resolution Relationship, the entry model of Megetsu's color inkjet printer. The resolution is about 720x720 dpi or 1440x720 dpi. The higher the resolution, the finer the dots, and the finer the dots, the more cohesiveness For example, if the amount of ink forming the ink dots is the same, the larger the cohesiveness of the ink dots, the smaller the outward expansion of the dots, and the more detailed the performance; on the contrary, the smaller the cohesiveness of the ink dots, the more outward The range of diffusion is also large, and the performance is rough. From this, we can know that the cohesion of the ink dot directly affects the print quality. In terms of general bubble-jet technology, if you want to drive a specific nozzle to make it eject The ink will first enable the heater corresponding to the nozzle to increase the temperature of the ink in the inkjet chamber to which the nozzle belongs to generate air bubbles. At this time, the viscosity of the ink will decrease as the temperature increases; Poor temperature control causes the ink to be overheated, which will cause the viscosity of the ink to be lower than normal, which will reduce the cohesion of the ink dots formed during printing and reduce the resolution. On the other hand, under normal conditions, heating In the case of ink, the temperature of the ink in the inkjet chamber will rise first, and then some of the thermal energy will be taken away by the ejected ink, which will cause the temperature of the ink in the inkjet chamber to drop. , That will cause the ink-jet ink indoor temperature is higher than expected, the ink viscosity is lower than the normal level. In addition, some of the nozzle holes frequently eject ink, so the ink temperature in the inkjet chamber is higher and the viscosity is lower; and other nozzle holes have not ejected ink for a long time, so the ink temperature in the inkjet chamber is lower and the viscosity is lower. Higher. All the above phenomena cause the ink viscosity to be unstable, which indirectly affects the print quality. Therefore, if (Please read the notes on the back before filling this page). Binding · Thread · A7 B7

Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs

4 Referring to FIG. 1a, a control block diagram of a conventional inkjet printer is shown. The inkjet printer 10 includes an actuating module u and an inkjet module U. When data needs to be printed, the control device 12 controls the driving device 13 according to the content of the data, and feeds the selection signal 14 to the nozzle array 16 At this time, the nozzle array 16 will heat the corresponding heater 19 according to the selection signal u to print out the data. On the other hand, a thermal resistor can be used to surround a part of the nozzle holes in the nozzle hole array 16 as a temperature detecting device 17 for sensing the nozzle hole temperature and feeding the temperature data back to the control device 12 for temperature control. Reference. Please refer to FIG. 1b, which shows the cross-sectional structure of the nozzle holes of the nozzle hole array 16 in FIG. 1a. As shown in the figure, the heater 19 is located near the nozzle hole 18, and is used to heat the ink in the inkjet chamber 21 to generate bubbles 20; the bubble 20 pushes the ink in the inkjet chamber 21 to spray from the nozzle holes 18 It can drop onto the paper to form ink dots. In the following, how to select the corresponding heater according to the selection signal 14 to cause the ink to be ejected from the ejection holes is described in detail with reference to FIG. 2. Please refer to FIG. 2, which shows a circuit diagram of the orifice array 16 in the ia diagram. As shown in the figure, the nozzle array 16 is a two-dimensional array circuit of M × N. During design, a resistor R is coupled to the transistor q to form a unit, and each unit is arranged corresponding to a nozzle. When a transistor Q is turned on, an electric current flows through the resistor R coupled to the transistor Q to generate heat to heat the ink in the inkjet chamber 21 so that bubbles are ejected from the corresponding nozzle holes is. In other words, ‘the resistance R here is used as the heater 19 to add ink (please read the precautions on the back before filling this page). Order: Wire ·

This paper size applies to China National Standard (CNS) A4 specifications (210 X 297 male: fixed =: hour = wide data _ number 14 = win the letter _ and two: = number: 'label L, χ2, χ3, ·, Xm is The signal is selected, ..., M, and the labels L γ2, γ3, ..., γN Bei1 is the selected line of view of the money 14 towels Yb, b = i, 2 ,, N,: text: will continue to use this The method of labeling is 'not otherwise explained. For example,' the selection and row selection signals are fed to the nozzle hole array 16 P, which can be turned on, and current flows through the resistor to cause ink to be ejected from the corresponding nozzle hole. By analogy, when the column selection signal x «and the row selection signal Y edge the human nozzle array 16, the transistor Qmn can be turned on, and the current flows through the resistance water to spray from the corresponding button. Therefore, according to the selection signal 14 Take the signal and the line to select the signal, you can accurately enable the nozzle holes corresponding to the signal to print the data. Please refer to Figure 3, which shows the nozzle holes 18 in Figure lb. Before and after the ink is ejected, The relationship between the nozzle hole temperature and time. Under normal circumstances, heating the ink will increase the temperature, and the ink will dissipate the heat after it is ejected from the nozzle hole. As a result, the temperature at the nozzle hole is reduced again, and the temperature change of the normal nozzle hole will approximate the solid line shown in the figure. Conversely, if abnormal conditions such as the nozzle hole blockage occur, the ink cannot be ejected from the nozzle hole, and naturally, the thermal energy cannot be dissipated. It is because the temperature drop at the nozzle hole is limited, and the temperature change of the abnormal nozzle hole will be approximated by the dotted line in the figure. From the first figure, it can be seen that in the traditional inkjet module 15, a heat around a part of the nozzle hole is used. The resistance is used as a temperature sensing device 17, and the thermal resistance of 479022 is printed by the Consumer Property Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs to print the A7 B7 inkjet head drive circuit with temperature detection function. 5. Description of the invention) The resistance value changes to obtain the temperature of the nozzle hole. . The temperature measured in this way is the average temperature of some or all of the orifices, and it is not possible to obtain a single orifice temperature change. Therefore, even if the temperature of the ink rises due to abnormality in one or some nozzle holes, these structures still cannot accurately find the crux of the problem, and the effect of temperature compensation is extremely limited. [Objective and Summary of the Invention] In view of this, the object of the present invention is to provide an inkjet head drive circuit with a temperature detection function, which can measure the temperature change at each nozzle hole and learn the nozzle hole status. Another object of the present invention is to provide an inkjet head driving circuit with a temperature detection function, which can arbitrarily read the temperature at the nozzle hole or heat the nozzle hole without greatly changing the original design. According to the purpose of the present invention, a driving circuit for an inkjet head with a temperature detection function is provided. A temperature detector and a heater are provided at the nozzle holes to heat the ink to eject from the nozzle holes, and measure the nozzle holes. Temperature of the ink. These inkjet head drive circuits with temperature detection function read the nozzle temperature according to the selection signal, and heat the ink according to the selection signal and the temperature signal to avoid misprinting when reading the temperature. These inkjet head drive circuits with temperature detection function include a temperature detection module and a heating module. The temperature detection module is used to detect the nozzle temperature, and the heating module is used to heat the ink. The temperature detection module is composed of a temperature detector and a temperature detection gate. The temperature detector is located at the nozzle and can generate a temperature detection signal corresponding to the temperature of the nozzle. The temperature detection gate is coupled with the temperature detector and is elected. When the signal is fed into the temperature detection gate, the temperature detection signal will be detected. On the other hand, the heating module includes a heater and a temperature gate. The heater is installed at the nozzle to heat the paper. The standard of China (CNS) A4 is applicable. Specifications (210 X 297 male S) (Please read the precautions on the back before filling this page) Order · Thread · 479022 A7

V. Description of the invention (厶) The drive circuit of the inkjet head with the ^ temperature function The zhizhi / JnL gate is coupled to the heater. When both the selection signal and the temperature signal are fed into the heating module, the heater can be heated for printing. In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is given below and described in detail with reference to the accompanying drawings. [Brief description of the drawings] Figure la shows a control block diagram of a conventional inkjet printer. Figure lb shows the cross-sectional structure of the nozzles of the nozzle array in Figure la. Figure 2 shows the circuit diagram of the orifice array in Figure 1a. Figure 3 shows the relationship between the temperature of the nozzle hole and the time before and after the ink is ejected from the nozzle hole of Figure lb. FIG. 4 is a schematic diagram of a cross-sectional structure of a spray hole according to a preferred embodiment of the present invention. Fig. 5 is a block diagram of the inkjet printer control provided in this embodiment. Figure 6 shows the control circuit of the nozzle array in Figure 5. Fig. 7 is a block diagram of the ink-jet head driving circuit with temperature detection function in Fig. 6. Figure 8a shows the circuit diagram of the temperature detection module in Figure 6. Figure 8b shows another circuit diagram of the temperature detection module in Figure 6. Figure 9a shows the circuit diagram of the heating module in Figure 6. Figure 9b shows another heating module in Figure 6_Circuit This paper size is based on the National Standard (CNS) A4 specification (21G X 297mm #) (Please read the precautions on the back before filling this page) Order :-Line · Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 479022 A7

Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. Figure 10 shows the control circuit of the linear nozzle. FIG. 11 is a block diagram of an inkjet head driving circuit with a temperature detection function in FIG. 10. Figure 12a shows the circuit diagram of the temperature detection module in Figure U. FIG. 12b is another circuit diagram of the price-temperature module in FIG. Figure 13 shows the circuit diagram of the heating module in Figure 11. [Description of drawing symbols] 10: Inkjet printer 11: Actuating module 12: Control device 13: Drive device 14: Selection signal 15: Inkjet device 16: Nozzle array 17: Temperature sensing device 18: Nozzle 19: Heater 20: Bubble 21: Inkjet chamber 100: Nozzle drive circuit with debt temperature function 110: Temperature detection module 150: Heating module 410: Temperature detector 450: Heater Standard (CNS) A4 specification (210 X 297 (please read the precautions on the back before filling this page): Binding-• Line · 479022 A7 B7 Inkjet head drive circuit with temperature detection function 5. Description of the invention (8) ( Please read the precautions on the back before filling this page) 500: Inkjet printer 510: Actuation module 520: Control device 530: Drive device 540: Select signal 550: Inkjet device 560: Nozzle array 570: A / D converter 580: temperature detection signal 600: inkjet head drive circuit with temperature detection function 610: temperature detection module 615: 彳 Temperature device 619: temperature detection gate 650: heating module 659: temperature detection gate: Temperature signal

Vt: Voltage R: Resistance Printed by the Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs

Rt: Thermistor TC: Thermocouples Q, Ql, Q2, Q3, Q4, Q5, Q6: Transistor Xa: Column selection signal Yb: Row selection signal [preferred embodiment] This paper scale is applicable to Chinese national standards (CNS ) A4 specification (210 X 297) 479022 Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 __— Inkjet head drive circuit with temperature detection function V. Description of the invention (j) Please refer to Figure 4, which shows the diagram according to A schematic view of a spray hole structure provided by a preferred embodiment of the invention. A heater 450 and a temperature detector 410 are provided at the spray hole 18. The function of the heater 450 is to heat the ink to generate air bubbles. For example, the heater 450 can It is a resistor or other device that can achieve this similar function. The temperature detector 410 is used to detect the temperature at the nozzle 18. For example, the temperature detector 410 can be a thermistor or other devices that can achieve this similar function. Device. Since the temperature detector 410 will generate a corresponding temperature detection signal as the temperature changes, you only need to detect the temperature detection signal to know the temperature change at the nozzle hole 18. This structure is set at each nozzle Holes, you can know exactly the nozzles Temperature change. Please refer to FIG. 5, which shows a control block diagram of the inkjet printer provided in this embodiment. The inkjet printer 500 includes an actuation module 510 and an inkjet module 550, wherein the actuation The module 510 includes a control device 520 and a driving device 530 to shame the selection signal 14 and the temperature signal into the nozzle array 560 to select the corresponding nozzle operation. In addition, the nozzle array 560 includes a heating module And temperature detection module (not shown), used to detect the nozzle temperature or heat the nozzle. When the nozzle temperature needs to be read, the drive device 530 can feed the selection signal 14 into the nozzle array 560, and Select the column selection signal Xa and the row selection signal Yb of the signal 14 and select the nozzle 18 to read the temperature, and then send the temperature detection signal 580. For different needs, you can choose to read only the temperature data of a single nozzle, or It reads out the temperature data of multiple or even all nozzles at one time. It should be noted that when you need to print the data, you need to select the letter (please read the precautions on the back before filling this page). • Binding · _-Line · The paper ruler Applicable Chinese National Standard (CNS) A4 size (210 X 297 public shame 1)

I Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 479022 A7 ___B7_ Inkjet head drive circuit with temperature detection function V. Invention Note (丨 〇) 14 is fed into the nozzle array 560, and the temperature signal needs to be sent In order to print the job, the corresponding spray hole 18 can be heated according to the selection signal 14. In other words, the temperature signal Η is used to separate the two functions of heating the ink and reading the temperature. If the temperature signal Η is not fed, only the nozzle temperature is read according to the selection signal 14; when the signal 14 and When the temperature signal is fed in, the data is printed according to the selected signal 14. In this way, the heating module is not driven when reading the temperature, which may cause misprints. The structure of the orifice array 560 will be described in FIG. 6. After the temperature detection signal 580 is detected, it can be fed into the A / D converter 570, and the temperature data of the nozzle 18 is fed back to the control device 520 through analog / digital conversion, so as to facilitate the execution of the temperature control work. It should be noted that the selection signal 14 can be divided into two types. One is to use the column selection signal and the row selection signal to reduce the number of signals and simplify the circuit. This is the design method that is commonly used at present; Each unit in the nozzle array 560 is controlled by an independent selection signal, which is called a linear nozzle structure. These design methods will increase the number of signals and complicate the circuit, which has been rarely used at present. However, the architecture of the present invention can be applied to two different control methods at the same time, so the technical content will be described in detail in the following two examples. Example 1: Please refer to FIG. 6, which shows the control circuit diagram of the nozzle array 560 in FIG. 5. The nozzle array 560 is a two-dimensional array circuit of M × N, which is composed of M × N ink-jet head driving circuits 600 having a temperature detection function. Among them, each temperature-sensing inkjet head drive circuit 600 is compatible with the Chinese National Standard (CNS) A4 specification (210 X 297mm) for this paper size (Please read the precautions on the back before filling this page) # Order-A7

B7 V. Statement ((丨) One-to-one correspondence of nozzles with temperature detection function for one-to-one correspondence, and is coupled to the opposite column selection signal Xa and row selection signal Yb. In addition, each temperature detection function The inkjet head driving circuit 600 is also coupled to the temperature signal Η, and the printing timing is determined accordingly. In order to make the drawings interlaced, the details of the signal connection are not shown here in detail, but the detailed signal coupling method Please refer to FIG. 7 for a block diagram of the inkjet head driving circuit 600 with temperature detection function in FIG. 6. The inkjet head driving circuit 600 with debt temperature function includes The temperature detection module 610 and the heating module 650 are both coupled to the column selection signal Xa and the row selection signal Yb, but only the heating module 650 is coupled to the temperature-generating signal 以 避免 to avoid false driving when reading the temperature Heating module 650. First, the operation mechanism of the temperature detection module 610 will be described. Please refer to FIG. 8a. The 8a shows the circuit diagram of the temperature detection module 61 in FIG. 6, including the temperature detection device 615 and the detection device. The temperature gate 619, among which, the love temperature device 615 is used to detect the temperature of the nozzle hole 18 and correspondingly generate a Wen 4 Lu No. 580 ', and the temperature detection gate 619 is used to detect the debt temperature signal 580 according to the selection signal 14. The temperature detection device 615 is made of a constant voltage source Vcc bias resistor R and a resistor RT. It should be noted that , The resistance R is a constant resistance, the resistance value is fixed; and the resistance RT is a temperature-controlled resistance, the resistance value changes with temperature, such as thermistor (thermistor), etc. In practical applications, the thermistor RT can be placed in the spray hole 18 points are used as the temperature detector 41. When the temperature of the nozzle 18 rises by two, the resistance value of the thermistor RT decreases, so the voltage Vt is also lower after the partial pressure; otherwise, when the temperature of the nozzle 18 decreases, The resistance of the thermistor RT increases, so after the voltage is divided, the voltage Vt is also high. Therefore, the voltage VT can be used as the debt temperature signal 580, which can be described as a mechanism.

479022 A7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. The ink head drive circuit with temperature detection function No. 580 (ie, voltage Vt) is generated according to the nozzle temperature. In addition, the transistor (^ and transistor Q2 can be coupled as a temperature detection gate 619 to detect the temperature detection signal 580. In practical applications, the transistor Qi can be coupled to the column selection signal Xa, and The transistor Q2 is coupled to the column selection signal Yb. As can be seen from the figure, the temperature detection signal 580 can be detected only when both signals are fed in. Therefore, when the temperature data needs to be read, only the The column selection signal Xa and the row selection signal Yb are fed into the temperature detection gate 619 to make it conductive, and the temperature detection signal 580 can be detected to know the nozzle temperature. Please refer to FIG. 8b, which is shown in FIG. 6 Another circuit diagram of the middle temperature detection module βίο, in which the temperature detection device 615 is implemented by a thermocouple (TC, thermocouple) device. In practical applications, the thermocouple device can be placed at the spray hole 18 for temperature detection When the nozzle 410 is used, the higher the temperature of the nozzle 18 is, the higher the voltage ^ generated by the thermocouple device is; on the other hand, if the temperature of the nozzle 18 is lower, the voltage ^ generated by the thermocouple device is also lower. The voltage VT is used as the temperature detection signal 580. By virtue of these mechanisms, the temperature detection signal 580 (that is, the voltage Vt) is based on The nozzle hole temperature is correspondingly generated. The structure and function of the temperature detecting gate 619 in Fig. 8b are the same as those in Fig. 8a, and will not be repeated here. Next, please refer to Fig. 9a, which shows the heating mold in Fig. 6 The circuit diagram of the group 650 includes a temperature brake 659 and a heater 45. In practical applications, a resistor RH can be used as the heater 45, which is located at the nozzle hole 18 to heat the ink and is coupled to the column selection. Signal χ &; On the other hand, transistor Q3 and transistor A can be coupled as a thermal gate 659 and coupled to a heater 450 to control the heating of the heater 45 °. The paper size applies Chinese national standards (CNS) A4 size mo X 297 male 遽 f (Please read the precautions on the back before filling out this page): Packing-Order · Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs and Consumer Cooperatives 479022 A7 B7 — ~ Mouth with temperature detection function Ink head drive circuit V. Description of the invention (/ 3) Timing, the coupling method is as shown in the figure. In practical application, the transistor Q3 can be coupled to the row selection signal Yb and the temperature signal H, and use The transistor Q4 is coupled to the heater 450. As can be seen from the figure, if only the column is selected The two signals of the signal Xa and the line selection signal Yb are fed, and the heater 450 cannot be enabled yet; only when the three signals of the selection signal Xa, the line selection signal Yb, and the temperature signal are fed into the heating module 650, can the order be made. The heater 450 heats up. Therefore, it can be said that these heating modules 650 heat the heater 450 according to the temperature signal Η and the column selection signal Xa and the row selection signal Yb. Of course, these heating modules 650 also have other implementations Mode, another heating module 650 circuit will be described in conjunction with Figure 9b. Next, please refer to Figure 9b, which shows another circuit diagram of the heating module 650 in Figure 6, including a thermal brake 659 and a heater 450. The difference from Figure 9a is that the thermal gate 659 is realized by coupling the crystal Q5 and the transistor Q6. In practical applications, the gate of the transistor Qs can be coupled to the row selection signal Yb, and the transistor The gate of Q6 is coupled to the temperature signal Η. As can be seen from the drawings, these structures can also achieve the above functions without departing from the spirit of the present invention. It should be noted that the spirit of the heating module 650 circuit provided in Example 1 lies in that: only when the selection signal Xa, the row selection signal Yb, and the temperature signal (three) are fed into the heating module 650, The heater 450 is heated. However, the feeding methods of these three should not be limited to the drawings. Those familiar with this technology can know that if the feeding ends of the three signals are replaced with each other, they can still perform the above functions without departing from the spirit of the present invention. Example 2: This paper size is in accordance with Chinese National Standard (CNS) A4 specifications (210 X 297 public-today (please read the precautions on the back before filling in this page) Order · Thread · 479022 Α7 5. Description of the invention (& Warm function inkjet head drive circuit Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. Figure 10 shows the control circuit diagram of the linear nozzle. Each heating device 10Q with detection / beach function b is selected by the signal Xa and The temperature signal Η is controlled. After the selection signal Xa is fed in, the nozzle orifice temperature corresponding to the signal can be read. When the selection signal Xa is fed in together with the temperature induction signal H, the signal Xa can be selected and selected. The corresponding nozzle ejects the ink. The mechanism is similar to the first example, so it will not be described in detail. Please refer to FIG. 11, which is a block diagram of the inkjet head driving circuit 100 with temperature detection function in FIG. 10. The temperature-sensing inkjet head drive circuit 100 includes a temperature detection module 110 and a heating module 15, both of which are coupled to the selection signal Xa, but only the heating module 15 is coupled to the temperature causing L number Η To prevent the heating module 15 from being driven by mistake when taking temperature. Please refer to Fig. 12a is a circuit diagram of the temperature detection module u0 in Fig. U. The operation mechanism of the temperature detection device 615 is the same as that of the first example, and is not repeated here. The temperature detection module 11 and the temperature detection module The difference of 61 () is that there is only one selection signal Xa in these circuits, so the temperature detection gate 119 can be realized only by using the transistor Q1. In practical applications, the transistor Q! And the debt temperature module can be used. 615 is coupled. When the signal Xa is selected and fed into the transistor to make it conductive, the temperature detection signal 58 (ie, voltage Vt) can be detected, and the nozzle temperature can be obtained accordingly. Refer to Figure 12b, which shows This is another circuit diagram of the temperature detection module UQ in Figure u. The temperature detection device 615 is implemented using a thermocouple TC. The operation mechanism is the same as the example, and is not repeated here. Similarly, the transistor 电 can be used as The temperature detection gate 119 is coupled to the temperature detection module 615. When the ^ number Xa is selected to be fed in, the temperature detection signal 58 ° (that is, the paper size of the voltage test paper is applicable to the China Standard (cns) A4 specification (x 297 public ^ ^ ------ (Please read the precautions on the back before filling this page) tT ·· --line-479022 Α7

Inkjet head drive circuit with temperature detection function This 墀 M knows the hole temperature Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs

Next, please refer to Figure 3, which shows the circuit diagram of the heating group I 150 in Figure η, including the temperature brake 159 and the heater 45. In practical applications, the resistor Rh can be used as a heater shed, which is located at the spray hole 18 and is coupled to the selection signal B. On the other hand, because the selection signal Xa is an independent signal, only a transistor Q is needed. As the temperature gate 159, it is sufficient. When both the selection signal Xa and the temperature signal 11 are fed into the heating module 150 ', the heater 450 can be heated. It should be noted that, in the preferred embodiment of the present invention, a metal oxide half field effect transistor (Mosm) is used to form a temperature detection gate and a temperature brake. The metal oxide half field effect transistor is not the only option for the circuit configuration. Familiar. The skilled person can also use circuits such as light junction junction transistors (Bm or junction field effect transistors (JFET) and other components to achieve similar functions of the present invention without departing from the spirit of the present invention. In addition, The method of the embodiment is only the case of this hair-example, «__ This invention i Anyone who knows this art well can change the signal feed end to get closer to the hair, but it is still not the same Spirit .: Applicable products, in addition to the inkjet printers mentioned in the article, the inkjet heads on office and office machines such as printers and printers can be used to control the temperature and improve the printing quality. [Effect of the invention] Take all the spray holes-precise, confrontation: = can be large:

479022 A7 _B7___ Inkjet head drive circuit with temperature detection function 5. Description of the invention () benefits. In summary, although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make various changes without departing from the spirit and scope of the present invention. And retouching, so the scope of protection of the present invention shall be determined by the scope of the attached patent application. (Please read the notes on the back before filling out this page) t · Order · Thread · Printed by the Employees' Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs This paper size applies to China National Standard (CNS) A4 (210 X 297)

Claims (1)

479022 Printed by A8, B8, C8, D8, inkjet head drive circuit with temperature detection function, consumer cooperative of the Ministry of Economic Affairs, Intellectual Property Bureau, a patent application scope 1. An inkjet head drive circuit with temperature detection function, suitable for one nozzle hole The inkjet head drive circuit with temperature detection function includes: a temperature detection module for detecting a temperature of the nozzle hole, the temperature detection module includes: a temperature detector provided at the nozzle hole, A temperature detection signal is generated according to the temperature correspondingly; and a temperature detection gate is coupled to a row of selection signals and a row of selection signals and the temperature detector, and the temperature detection signal is detected according to the column of selection signals and the row of selection signals. A heating module, the heating module includes: a heater provided at the spray hole and coupled to the column selection signal; and a uniform temperature gate coupled to the row selection signal and the uniform temperature Signal and the heater, wherein the heating module heats the heater according to the temperature signal, the column selection signal and the row selection signal. 2. The inkjet head drive circuit with temperature detection function as described in item 1 of the patent application scope, wherein the temperature detector is a thermistor. 3. The inkjet head drive circuit with temperature detection function as described in item 1 of the patent application scope, wherein the temperature detector is a thermocouple. 4. The inkjet head driving circuit with temperature detection function as described in item 1 of the scope of patent application, wherein the temperature detection signal is a voltage signal. 5. The temperature-detecting inkjet head driving circuit as described in the first patent application scope, wherein the temperature detecting gate includes a first transistor and a second transistor, the first transistor and the second transistor Transistor coupling, the first paper size is applicable to China National Standard (CNS) A4 specifications (210 X 297 public meal I? (Please read the precautions on the back before filling this page) Order · Line · Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. The system is selected from this column, and the second transistor system is connected to the selected signal from the bank. -6. The inkjet head drive circuit with a temperature detection function as described in item 5 of the scope of the patent application, wherein the first transistor and the second transistor are metal-oxide-semiconductor half field effect transistors. 7. The inkjet head drive circuit with temperature detection function as described in item 5 of the scope of the patent application, wherein the first transistor and the second transistor system interface a field effect transistor. 8. The ink-jet head driving circuit with temperature detection function as described in item 5 of the scope of the patent application, wherein the first transistor and the second transistor are bipolar junction transistors. 9. The inkjet head drive circuit with temperature detection function as described in item 1 of the scope of patent application, wherein the heater is a resistor. 10. The temperature-sensitive inkjet head drive circuit according to item 1 of the scope of the patent application, wherein the thermal brake includes a first transistor and a second transistor, the first transistor and the second transistor The transistor is coupled, the first transistor system is coupled to the row selection signal, and the second transistor system is coupled to the temperature-induced signal. u. The ink-jet head driving circuit with temperature detection function as described in item 10 of the patent application scope, wherein the first transistor and the second transistor are metal-oxide-semiconductor field-effect transistors. 12. The ink-jet head driving circuit with a temperature detection function as described in item 10 of the scope of the patent application, wherein the first transistor and the second transistor system interface a field-effect transistor. Standards for this paper: Standard specifications for financial professionals (210 x 297 public reference p (please read the note on the back? Matters before filling out this page)-installed tl · • line · 479022 Printed by the Employees ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A8 B8 C8 D8 Inkjet head drive circuit with temperature detection function 6. Application for patent scope 13. The inkjet head drive circuit with high temperature function described in item 10 of the patent application scope, wherein the first transistor and the The second transistor system has a bipolar junction transistor. 14. An inkjet head drive circuit with a temperature detection function, which is suitable to be arranged corresponding to an injection hole. The inkjet head drive circuit with a temperature detection function includes: A module for detecting and detecting a temperature of the nozzle hole, the temperature detecting module includes: a temperature detector disposed at the nozzle hole, and generating a temperature detection signal corresponding to the temperature; and a detection The temperature gate is coupled to the temperature detector and a selection signal, and the temperature detection signal is detected according to the selection signal; a heating module, the heating module includes: a heater, the heater is disposed in the nozzle hole And coupled to the selection signal; and a uniform temperature brake The temperature brake is coupled to the heater and a uniform temperature signal, wherein the heating module heats the heater according to the temperature signal and the selection signal. 15. The device described in item 14 of the scope of patent application Inkjet head drive circuit with temperature detection function, wherein the temperature detector is a thermistor. 16. Inkjet head drive circuit with temperature detection function described in item 14 of the scope of patent application, wherein the temperature detector is thermal 17. The inkjet head drive circuit with temperature detection function as described in item 14 of the scope of patent application, wherein the temperature detection signal is a voltage signal. 18. The temperature detection function as described in item 14 of scope of patent application (Please read the precautions on the back before filling this page) i Binding. Thread _ This paper size applies to China National Standard (CNS) A4 specifications (210 X 297 printed by the Intellectual Property Bureau of the Ministry of Public Economics and Staff Consumer Cooperatives) B8-C8 ----------- D8 VI. Apply for patent Fanyuan '~ Inkjet head drive circuit with temperature detection function Inkjet: drive circuit, in which the temperature detection gate is a transistor. 19 \ If applied The inkjet head drive motor with temperature detection function described in item 18 of the patent scope Among them, the transistor system is a metal-oxygen half-field-effect transistor. 20. The Mobe drive circuit with temperature detection function as described in item 18 of the patent application scope, wherein the transistor system is connected to a field-effect transistor. 21 · The inkjet head drive circuit with temperature detection function as described in item 18 of the patent application scope, wherein the transistor system has a bipolar junction transistor. 22 · The temperature detection function as described in item 14 of the patent application scope The inkjet head driving circuit, wherein the heater is a resistor. 23. The inkjet head moving circuit with a temperature detection function as described in item 14 of the Shenjing patent scope, wherein the temperature-controlling gate is a transistor. The temperature-sensing inkjet head drive circuit according to item 23 of the patent application scope, wherein the transistor system is a metal-oxide-half field-effect transistor. 25. The inkjet head driving circuit with temperature detection function as described in item 23 of the scope of patent application, wherein the transistor system is connected to a field effect transistor. 26. The inkjet head drive circuit with temperature detection function as described in item 23 of the scope of patent application, wherein the transistor system has a bipolar junction transistor. 27 · —An inkjet head driving circuit with a temperature detection function, which can separately measure the temperature of a plurality of nozzle holes of the inkjet head and respectively drive the plurality of nozzle holes to eject ink. The inkjet head drive circuit includes : A temperature detection module that can detect the temperature of a nozzle and generate a temperature detection signal. The temperature detection module is coupled to a nozzle selection signal and can detect the temperature detection signal based on the nozzle selection signal. ; A heating module, coupled to the nozzle selection signal and consistent temperature (Please read the precautions on the back before filling out this page) Binding ·-· Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs's Consumer Cooperatives 479022 A8 B8 C8 D8 Inkjet head drive circuit with temperature detection function 6. Patent application scope number The heating module can heat the nozzle to eject ink according to the nozzle selection signal and the temperature signal. 28. The inkjet head drive circuit described in item 27 of the scope of patent application, wherein the temperature detection module further includes a temperature detector and a temperature detection gate, and the temperature detector can generate the detection according to the temperature of the nozzle hole. The temperature detection gate is coupled to the nozzle selection signal, and the temperature detector can be driven to detect the temperature detection signal according to the nozzle selection signal. 29. The inkjet head driving circuit as described in item 27 of the scope of patent application, wherein the heating module further includes a heater and a uniform temperature gate, wherein the temperature gate is coupled to the nozzle selection signal and the temperature Signal, and the heater can be driven according to the nozzle selection signal and the temperature signal to heat the nozzle to eject ink. 30. The inkjet head driving circuit according to item 27 of the scope of the patent application, wherein the nozzle selection signal is composed of a row of selection signals and a row of selection signals. 31. The inkjet head drive circuit described in item 30 of the scope of patent application, wherein the temperature detection module further includes a temperature detector and a temperature detection gate, and the temperature detector can generate the detection according to the temperature of the nozzle hole. The temperature detection gate is coupled to the column selection signal and the row selection signal, and the temperature detector can be driven to detect the temperature detection signal according to the column selection signal and the row selection signal. 32. The inkjet head drive circuit as described in item 30 of the scope of patent application, wherein the heating module further includes a heater and a uniform temperature gate, wherein the heater is coupled to the column selection signal, and the temperature gate is coupled The paper size applied to this bank is in accordance with the Chinese National Standard (CNS) A4 specifications (210 X 297 public disputes (please read the precautions on the back before filling this page). Lamps and wires. 479022 A8 B8 C8 D8 Inkjet head drive circuit 6. The patent application range selection signal and the temperature signal, the heating module can cause the heater to heat the nozzle and eject the ink according to the column selection signal, the row selection signal and the temperature signal. (Please read the notes on the back before filling out this page) Printed by the Employees' Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs This paper is printed in accordance with the Chinese National Standard (CNS) A4 (210 X 297 public transformers)